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What is ChaNGa?

ChaNGa (Charm N-body GrAvity solver) is a code to perform collisionless N-body simulations. It can perform cosmological simulations with periodic boundary conditions in comoving coordinates or simulations of isolated stellar systems. It uses a Barnes-Hut tree to calculate gravity, with quadrapole expansion of nodes and Ewald summation for periodic forces. Timestepping is done with a leapfrog integrator with individual timesteps for each particle. ChaNGa's novel feature is the use of the Charm++ parallel programming system, including its dynamic load balancing schemes, in order to obtain high performance on massively parallel systems. It has been shown to scale well up to 20,000 processors on an IBM Bluegene/L.

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